下列关于万有引力大小的计算式F=Gm1m2r2的说法正确的是（ ） A．当两物体

读下面电视节目预告,选择正确答案。

TV PROGRAMMES                             Channel 1                             Channel 2 18:00 Arouud China 18:30 Children's programme 19:00 News 19:30 Weather Report 19:40 Around the World 20:10 TV play: Sisters 21:00 English for Today 21:15 Popular Music 2l:55 Talk Show 17:45 Computers Today 18:10 Foreign Arts 18:30 English Classroom 19:00 Animal World 19:25 China's 2003 20:20 Sports 21:00 TV play: Guo Lanying 21:45 English News 22:05 On TV Next Week

1．If you want to watch a football game, the best programme for you would be ________.

A．TV play     B．Sports       C．Around the World D．Talk Show

2．The programme of ________ will let you know much about western (西方的) countries.

A．Sisters                       B．Around China C．Around the World               D．On TV Next Week

3．If you want to know something about tigers, elephants and monkeys, the best programme for you is ________.

A．Around China                 B．Animal World C．TV play                       D．Foreign Arts

4．English classroom is a programme that  ________.

A．lets you know something about classrooms B．tells you something about students C．lets you know something about school life D．teaches you English

5．The programme at the end of Channel 2 means  ________ on TV next week.

A．news       B．programmes     C．people         D．places

假如你是一位生活在南宋末年的文人，你的书房里有可能出现的书籍有 （  ）

①《资治通鉴》       ②苏轼词集   

③小说《三国演义》   ④关汉卿著《窦娥冤》

A．①②

B．②③

C．③④

D．①④

根据下列要求作图：

（1）如图1所示，轻质硬棒OB可绕O点转动，在A处挂上一个重物G后，在B点施加一个力F，使硬棒静止于图示位置，画出F₁的力臂L₁，及F₂的力臂L₂．

（2）如图2，磁体旁小磁针静止时所指的方向如图所示（小磁针黑端为N极），请画出图中任一条磁感线的方向，并标出磁体的S、N极．

（3）小亮发现教室中一个开关可以同时控制两盏额定电压为220V的灯，并且这两盏灯能正常发光．请你在图3中画出电路的正确连接情况．

根据键能数据估算CH₄ (g）+4F₂ (g) ＝CF₄+4HF(g）的反应热ΔH为（   ）  

化学键	C—H	C—F	H—F	F—F
键能/（kJ/mol）	414	489	565	155

A．–1940 kJ · mol^－1     B．1940 kJ · mol^－1   

C．–485 kJ · mol^－1      D．485 kJ · mol^－1

根据解剖学知识，并联系实际，谈谈准备活动的意义？